Draft-rigging.



NsrTED STATESl PATENT OFFICE...

WILLIAM MORGAN PIPER, QE ALLEGHENY, PENNSYLVANIA.

DRAFT-HIGGING.

SPECIFICATION forming part of Letters Patent N o. 693,333, dated February 11, 1902. Application filed November 26, 1900. Renewed August 17. 1901- Serial No. 72,418. (No model.)

TootZZ whom it' may concern.:

Be it known that I, 'WILLIAM MORGAN PI- PER, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Draft-Riggings, of which the following is a full, clear, and exact description, reference beingV had to the accompanying drawings, forming part of this specification, in which- `Figure 1 is atop plan View of a rigging constructed in accordance with my invention; and Fig. 2 is a similar view on a smaller scale, showing a modiiied form.

Myinvention relates to that 'class of draftriggings wherein a resistance is provided by means of spring-pressed blocks having Vcoactiug inclined surfaces, as in my Patent No. 566,935, dated September 1, 1896; andit is designed to provide an improved form of such device wherein a pair of blocks with springsbetween them will beforced apart under either a bufting or pulling strain.

In the drawings, 2 2 represent the draft timbers or irons, and 3 the draw-bar, having a strap 4, throughwhich extend the transverse end blocks 5 5. Each yof these blocks is provided Vwith opposite inclines 6 6, the inclination being outward instead of inward,

as in my previous forms. "A pair of oppo sitely-located blocks 7 7 are provided with end faces, fitting upon and coacting with the faces 6 6, and these blocks 7 7 are normally held in their inner position by means of in termediate tensionsprings S 8, having their end portions secured in the blocks.

To increase the resisting power of the device, I may provide the pin 9, which is centrally located in a transverse position and has oppositely-screw-threaded end portions engaging correspondingly-screw-threaded holes in the blocks 7 7. The screw-threads are made with a quick pitch, and as they extend in opposite directions any movement of the blocks 7 7 toward or from each other will rotate the shaft, which will exert acertain resistance dependent on the pitch of the thread.

The operation is apparent. Under either bufting or pulling strains one of the blocks 5 will be moved toward the other, and the inclined or wedge faces will force. the blocks 7 7 apart against the tension of the springs and the resist-ance of the screw. Upon the removal of the strain the springs will return the parts to normal position.

In the form of Fig. 2 the blocks 7 7 are moved outwardly under the strains in the same way as the first form; but instead of securing the springs to the blocks Iuse the oppositely-extending bolts 10 10', two of which have their outer ends secured in one of the blocks 7, while the other is secured to the other block, while its inner end is-secured to a bar or plate 11, against which the spring 8 bears. This spring 8 is held between the plates 11, and whenever a buffing or pulling strain is exerted upon the draw-bar the blocks 7 7 will be moved outwardly, and the springs in this case will be compressed instead of put into'tension, as in the form of Fig. 1. The operation of this form is similar to that of the first form as regards the movements of the blocks, and the screw-threaded shaft or pin may or may not be used, as desired.

The advantages of my invention result from the arranging of the blocks so that the opposite blocks will be moved apart under the strains against the resistance of the intermediate springs. The device is compact and of great power, while taking up smallspace. 4

Many changes may be made in the form and arrangement of the springs, the blocks, and the inclined faces without departing from my invention.

I claim- 4 l. The combination with a longitudinallymovable bar, of oppositely-located blocks arranged to move toward and from each other on opposite sides of the draw-bar axis, atension-spring between the blocks arranged to hold them in place, and mechanism connected with the bar and arranged to force the blocks apart under strains exerted through the bar; substantially as described.

2. In a draft device, a draw-bar having transversely-extending blocks with inclined faces, and oppositely-located blocks on either side of the draw-bar axis having springs between them, and arranged to move from each other against the resistance of the said intermediate springs, the transverse blocks being arranged to force apart the spring-pressed blocks under buftlng or pulling strain; substantially as described.

3. In a draft-rigging, a draw-bar having 1o and from the draw-bar axis, a spring nterposed between said blocks and normally holding; them in their inner position, and mechanism connected with the bar arranged to force the blocks apart on their bufiing or pulling strain; substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM MORGAN PIPER.

Witnesses:

C. P. BYRNES, GEO. B. BLEMING. 

